504272 ÷ 21 
We want to figure out the number of times 504272 can be divided by 21.

Advancing to step 1:
5 divided by 21 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Fetch the next digit (0) from the dividend, attach it to 5 and continue: 50 / 21

Moving on to step 2:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 8 after subtracting 42 from 50.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 21

Advancing to step 3:
21 can be fit into 84 4 times, resulting in a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
Deduct 84 from 84 and we're left with 0.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 21

On to step 4:
2 divided by 21 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 240.0
If we subtract 0 from 2, we get 2.
Bring next digit (7) of the dividend behind the 2 and repeat the process: 27 / 21

Let's proceed to step 5:
When dividing 27 by 21, we get 1 with a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 2401.0
Deduct 21 from 27 and we're left with 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 21

Going ahead to step 6:
62 divided by 21 is 2 with a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 24012.0
The remainder is 20 after subtracting 42 from 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 7:
21 can be fit into 200 9 times, resulting in a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 24012.9
Subtracting 189 from 200 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 8:
When dividing 110 by 21, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 24012.95
Deduct 105 from 110 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 9:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 24012.952
Subtracting 42 from 50 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 10:
If we divide 80 by 21, we get 3 and a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 24012.9523
If we subtract 63 from 80, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 11:
170 divided by 21 is 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 24012.95238
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 12:
20 divided by 21 is 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 24012.95238
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 13:
21 goes into 200 9 times with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 24012.9523809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 14:
21 goes into 110 5 times with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 24012.95238095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 24012.95238095, with a leftover of 5e-09.